Measuring and testing – Navigation – Rate of climb
Patent
1979-08-13
1980-09-23
Gill, James J.
Measuring and testing
Navigation
Rate of climb
73509, 367130, G01C 1300, G01C 2300
Patent
active
042235561
ABSTRACT:
A filter for use in determining the vertical displacement of a body travelling through water relative to a datum such as mean sea level, and having specific application to underwater seismic systems in which a towed body forms a part of equipment for producing profiles of the terrain beneath bodies of water. A vertical displacement signal is produced from a signal, generated by an accelerometer, indicative of the vertical acceleration of the body and a position signal, generated by a pressure transducer, indicative of the vertical displacement of the body, the position signal being corrupted by pressure transducer noise. The filter comprises a first filter portion for receiving the position signal, the first filter portion having a transfer function which is substantially the product of a predetermined gain divided by the pressure transducer gain and a first real rational polynomial function of the form P.sub.1 (s)/Q(s). The filter includes a second filter portion for receiving the acceleration signal, the second filter portion having a transfer function which is substantially the product of the predetermined gain divided by the accelerometer gain and a second real rational polynomial function of the form sP.sub.2 (s)/Q(s). A summer is provided to produce a signal proportional to the sum of the first and second filter portion signals.
REFERENCES:
patent: 3196691 (1965-07-01), Escobosa
patent: 4091356 (1976-12-01), Hutchins
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